Question about Microwave Ovens
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Posted on Jan 02, 2017
the service manual for this model and have uploaded it to our
site here to help you.
You will need the free Acrobat Reader to view or print it in case you don't have it.
It may be the fuse, which is usually located behind the grille or on the floor of the oven behind the control panel or between the door switches.
If the fuse is good, it may be an open thermostat or thermal cutout (TCO) / thermal fuse on or near the magnetron or on top of the cavity / body of the oven.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open.
Then when it cools, it closes the circuit and allows power through again.
When checking TCOs or thermostats, if it has a hood fan thermostat, that should read open, as opposed to the others, which should read closed.
If the cavity thermostat needs to be checked or replaced you'll need to pull the oven from the wall.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If it goes dead or blows the breaker (or GFI) when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.
If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.
You should do a continuity test on the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again.
If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.
If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.
To order Goldstar / L.G. parts, visit Vance Baldwin Electronics. You'll probably have to call them.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Dec 13, 2008
SOURCE: dead microwave oven
If you have a multimeter and are comfortable with testing "live" circuits, measure to see if there is voltage from chassis ground, to both ends of the fuse, or to each wire connection on the fuse holder.If no voltage, then the problem is very likely the wall plug does not have power (could be a wire broke inside the wall box.).
If there is power, chances are there is a controller board problem. You should have seen a wiring diagram/schematic when you disassembled to replace the fuse.
Posted on Jan 20, 2009
SOURCE: Microwave stopped working
All you have to do is locate the fuse, and then check for continuity, or measure ac current on both side of the fuse. If ther is 120vac on one side and none on the other side then it is blown.
Posted on Aug 12, 2009
SOURCE: No power to microwave?
The cord may be defective either 1) at the plug end, 2) internally inside your microwave, or 3) inside the cord itself.
Otherwise there may be an internal fuse that has blown due to a surge, etc.
It is not so difficult to check. Open the rear cover of the unit, and check for an in-line fuse. If there isn't one, or if it's okay, then use a tester to confirm if power is getting to the unit by placing the probes on on both positive and negative contacts. If you don't have a tester, you can use a basic unit (a light with 2 wires/probes) that Home Depot has in the electrical department for a couple of bucks.
Posted on Sep 07, 2009
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